nixpkgs/nixos/modules/services/databases/redis.nix
Florian Klink ff2fd6c4e5 nixos/redis: unbreak module
The redis module currently fails to start up, most likely due to running
a chown as non-root in preStart.

While at it, I hardcoded it to use systemd's StateDirectory and
DynamicUser to manage directory permissions, removed the unused
appendOnlyFilename option, and the pidFile option.

We properly tell redis now it's daemonized, and it'll use notify support
to signal readiness.
2019-09-01 14:08:42 +02:00

227 lines
6.8 KiB
Nix

{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.redis;
redisBool = b: if b then "yes" else "no";
condOption = name: value: if value != null then "${name} ${toString value}" else "";
redisConfig = pkgs.writeText "redis.conf" ''
port ${toString cfg.port}
${condOption "bind" cfg.bind}
${condOption "unixsocket" cfg.unixSocket}
daemonize yes
supervised systemd
loglevel ${cfg.logLevel}
logfile ${cfg.logfile}
syslog-enabled ${redisBool cfg.syslog}
pidfile /run/redis/redis.pid
databases ${toString cfg.databases}
${concatMapStrings (d: "save ${toString (builtins.elemAt d 0)} ${toString (builtins.elemAt d 1)}\n") cfg.save}
dbfilename dump.rdb
dir /var/lib/redis
${if cfg.slaveOf != null then "slaveof ${cfg.slaveOf.ip} ${toString cfg.slaveOf.port}" else ""}
${condOption "masterauth" cfg.masterAuth}
${condOption "requirepass" cfg.requirePass}
appendOnly ${redisBool cfg.appendOnly}
appendfsync ${cfg.appendFsync}
slowlog-log-slower-than ${toString cfg.slowLogLogSlowerThan}
slowlog-max-len ${toString cfg.slowLogMaxLen}
${cfg.extraConfig}
'';
in
{
###### interface
options = {
services.redis = {
enable = mkOption {
type = types.bool;
default = false;
description = ''
Whether to enable the Redis server. Note that the NixOS module for
Redis disables kernel support for Transparent Huge Pages (THP),
because this features causes major performance problems for Redis,
e.g. (https://redis.io/topics/latency).
'';
};
package = mkOption {
type = types.package;
default = pkgs.redis;
defaultText = "pkgs.redis";
description = "Which Redis derivation to use.";
};
port = mkOption {
type = types.int;
default = 6379;
description = "The port for Redis to listen to.";
};
vmOverCommit = mkOption {
type = types.bool;
default = false;
description = ''
Set vm.overcommit_memory to 1 (Suggested for Background Saving: http://redis.io/topics/faq)
'';
};
openFirewall = mkOption {
type = types.bool;
default = false;
description = ''
Whether to open ports in the firewall for the server.
'';
};
bind = mkOption {
type = with types; nullOr str;
default = null; # All interfaces
description = "The IP interface to bind to.";
example = "127.0.0.1";
};
unixSocket = mkOption {
type = with types; nullOr path;
default = null;
description = "The path to the socket to bind to.";
example = "/run/redis/redis.sock";
};
logLevel = mkOption {
type = types.str;
default = "notice"; # debug, verbose, notice, warning
example = "debug";
description = "Specify the server verbosity level, options: debug, verbose, notice, warning.";
};
logfile = mkOption {
type = types.str;
default = "/dev/null";
description = "Specify the log file name. Also 'stdout' can be used to force Redis to log on the standard output.";
example = "/var/log/redis.log";
};
syslog = mkOption {
type = types.bool;
default = true;
description = "Enable logging to the system logger.";
};
databases = mkOption {
type = types.int;
default = 16;
description = "Set the number of databases.";
};
save = mkOption {
type = with types; listOf (listOf int);
default = [ [900 1] [300 10] [60 10000] ];
description = "The schedule in which data is persisted to disk, represented as a list of lists where the first element represent the amount of seconds and the second the number of changes.";
example = [ [900 1] [300 10] [60 10000] ];
};
slaveOf = mkOption {
default = null; # { ip, port }
description = "An attribute set with two attributes: ip and port to which this redis instance acts as a slave.";
example = { ip = "192.168.1.100"; port = 6379; };
};
masterAuth = mkOption {
default = null;
description = ''If the master is password protected (using the requirePass configuration)
it is possible to tell the slave to authenticate before starting the replication synchronization
process, otherwise the master will refuse the slave request.
(STORED PLAIN TEXT, WORLD-READABLE IN NIX STORE)'';
};
requirePass = mkOption {
type = with types; nullOr str;
default = null;
description = "Password for database (STORED PLAIN TEXT, WORLD-READABLE IN NIX STORE)";
example = "letmein!";
};
appendOnly = mkOption {
type = types.bool;
default = false;
description = "By default data is only periodically persisted to disk, enable this option to use an append-only file for improved persistence.";
};
appendFsync = mkOption {
type = types.str;
default = "everysec"; # no, always, everysec
description = "How often to fsync the append-only log, options: no, always, everysec.";
};
slowLogLogSlowerThan = mkOption {
type = types.int;
default = 10000;
description = "Log queries whose execution take longer than X in milliseconds.";
example = 1000;
};
slowLogMaxLen = mkOption {
type = types.int;
default = 128;
description = "Maximum number of items to keep in slow log.";
};
extraConfig = mkOption {
type = types.lines;
default = "";
description = "Extra configuration options for redis.conf.";
};
};
};
###### implementation
config = mkIf config.services.redis.enable {
boot.kernel.sysctl = mkIf cfg.vmOverCommit {
"vm.overcommit_memory" = "1";
};
networking.firewall = mkIf cfg.openFirewall {
allowedTCPPorts = [ cfg.port ];
};
users.users.redis.description = "Redis database user";
environment.systemPackages = [ cfg.package ];
systemd.services.disable-transparent-huge-pages = {
description = "Disable Transparent Huge Pages (required by Redis)";
before = [ "redis.service" ];
wantedBy = [ "redis.service" ];
script = "echo never > /sys/kernel/mm/transparent_hugepage/enabled";
serviceConfig.Type = "oneshot";
};
systemd.services.redis =
{ description = "Redis Server";
wantedBy = [ "multi-user.target" ];
after = [ "network.target" ];
serviceConfig = {
ExecStart = "${cfg.package}/bin/redis-server ${redisConfig}";
RuntimeDirectory = "redis";
StateDirectory = "redis";
Type = "notify";
User = "redis";
};
};
};
}